I like Mullvad but it can actually be challenging to purchase a subscription in the US. Most prepaid cards block the purchase. Sure, you can use it with a fully tracked card etc. but that's not really the target audience.
Mozilla sells a $5/mo VPN service which is a user-friendly reskinned Mullvad.
Isn’t this like the one legitimate use for Monero?
It is, although then the next problem is getting Monero in the US with their clutterfuck of cryptocurrency regulations, so you have to find an exchange that works with Monero and actually works in the US, then give them your identity and bank account information and hope they don't think you're suspicious and block you.
You could acquire a different crypto on a US exchange such as BCH and then use a DeX which doesn't require any personal information to swap into Monero. You could buy a Mullvad giftcard on Amazon but then Amazon would know that someone at your address has a Mullvad subscription.